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    copied!<p>Because the <code>BindingListView&lt;T&gt;</code> project uses .NET Framework v2.0 and predates LINQ, it doesn't expose an <code>IEnumerable&lt;T&gt;</code> for you to query on. Since it <strong>does</strong> implement non-generic <code>IEnumerable</code> and non-generic <code>IList</code>, you can use <code>Enumerable.Cast&lt;TResult&gt;</code> to convert the collection into a form suitable for use with LINQ. However, this approach isn't that helpful because the <code>IEnumerable</code> that <code>AggregateBindingListView&lt;T&gt;</code> returns is an internal data structure with type <code>KeyValuePair&lt;ListItemPair&lt;T&gt;, int&gt;</code>.</p> <p>To upgrade this project for convenient use with LINQ, the simplest approach might be to implement <code>IEnumerable&lt;T&gt;</code> on <code>AggregateBindingListView&lt;T&gt;</code>. First add it to the declaration of the class:</p> <pre><code>public class AggregateBindingListView&lt;T&gt; : Component, IBindingListView, IList, IRaiseItemChangedEvents, ICancelAddNew, ITypedList, IEnumerable&lt;T&gt; </code></pre> <p>and then implement it at the end of the class definition:</p> <pre><code>#region IEnumerable&lt;T&gt; Members IEnumerator&lt;T&gt; IEnumerable&lt;T&gt;.GetEnumerator() { for (int i = 0; i &lt; _sourceIndices.Count; i++) yield return _sourceIndices[i].Key.Item.Object; } #endregion </code></pre> <p>and now you can use LINQ directly on a <code>BindingListView&lt;T&gt;</code> instance like this:</p> <pre><code>// Create a view of the items itemsView = new BindingListView&lt;Item&gt;(feed.Items); var descriptions = itemsView.Select(t =&gt; t.Description); </code></pre> <p>Remember to upgrade all the projects from .NET Framework v2.0 to .NET Framework 4 Client Profile and add <code>using System.Linq;</code> in order for this to work with your current project.</p>
 

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